<li>
  <br/>
   <!-- <%= f.file_field :image_url %> <br />  -->
  <a class="fancybox" rel="gallery1" href="<%= f.object.image_url.to_s %>"> <%= image_tag f.object.image_url.thumb.to_s unless f.object.image_url.blank? %> </a><br />
    <!-- <%=  link_to_remove_association "remove", f %> -->
    <br/>
</li>
